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CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 26, 2021	Jun. 27, 2020	Jun. 26, 2021	Jun. 27, 2020
Statement of Comprehensive Income [Abstract]
Net earnings	$ 62,657	$ 22,754	$ 117,658	$ 65,475
Foreign currency translation adjustments:
Unrealized translation gain (loss)	10,690	18,888	(1,943)	(30,493)
Gain (loss) on hedging activities:
Net investment hedges	0	(1,427)	0	7,284
Cash flow hedges	(313)	(73)	(291)	370
Amortization cost included in interest expense	(16)	(16)	(32)	(32)
Commodity hedges	16,308	0	26,254	0
Realized gain on commodity hedges recorded in earnings	(270)	0	(270)	0
Cross currency swaps	(2,095)	(2,007)	1,511	4,295
Defined Benefit Pension Plan:
Actuarial gain	843	0	1,675	0
Other comprehensive income (loss)	25,147	15,365	26,904	(18,576)
Comprehensive income	87,804	38,119	144,562	46,899
Comprehensive income attributable to noncontrolling interests	(1,573)	(130)	(1,087)	(427)
Comprehensive income attributable to Valmont Industries, Inc.	$ 86,231	$ 37,989	$ 143,475	$ 46,472

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